The sliding of rubber bearing (RB) is a common phenomenon under seismic excitation, which will cause a series of chain reaction, consisting of larger displacement of girder, collision among girders and even girder falling. The sliding problem of RB was studied through experiments in this paper. The results showed that: RB of typical highway bridges will slide less than the seismic load of fortification intensity. It is difficult to meet the requirements of ‘Guideline for Seismic Design of Highway Bridges’, which prescribes that RB is not allowed to slide under earthquake action. The upper surface of RB will slide more early than the lower surface and the sliding frequency and extend are also greater for the upper surface. The sliding of RB has a certain isolation effect, which can effectively reduce the seismic response of bridge. However, the isolation effect is unstable. The bearing lock-pressure caused by the large deformation of the lower part of the structure will prevent the further expansion of the sliding displacement, which indirectly play a role in preventing the girder falling. The uneven pressures among the bearings will cause a local larger stress of some piers, which may lead to an earlier failure of piers during earthquake.
WANG Kairui, XU Xiuli, LI Xuehong, LI Zhijun, TIAN Guowei, LIU Weiqing .
Study of the concrete continuous girder bridge shaking table test considering the sliding of laminated rubber bearings[J]. Journal of Vibration and Shock, 2017, 36(12): 68-74
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